Zep 45 Penetrating Lubricant is a professional-grade aerosol that penetrates rust and corrosion to free stuck bolts, hinges, and metal parts. It stops squeaks, provides lasting lubrication, and displaces moisture to help protect tools and equipment from future rust in the garage, workshop, and home. The Blue Microfiber Rag is a durable, reusable, lint-free cloth suited for wiping excess lubricant from tools and metal surfaces after applying the penetrant, keeping the work area clean after use. Together, this combination supports complete rust and lubrication maintenance — the penetrating lubricant frees seized metal parts and protects against corrosion while the microfiber rag removes excess lubricant and keeps tools and work surfaces clean.